1 /* Copyright (c) 2016-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
14 #include <initializer_list>
18 #include <type_traits>
22 #include <xbt/config.h>
23 #include <xbt/sysdep.h>
28 template<class T> inline
29 std::string to_string(T&& value)
31 return std::to_string(std::forward<T>(value));
33 inline std::string const& to_string(std::string& value)
37 inline std::string const& to_string(std::string const& value)
41 inline std::string to_string(std::string&& value)
43 return std::move(value);
48 template <class T> XBT_PUBLIC void set_default(const char* name, T value);
50 extern template XBT_PUBLIC void set_default<int>(const char* name, int value);
51 extern template XBT_PUBLIC void set_default<double>(const char* name, double value);
52 extern template XBT_PUBLIC void set_default<bool>(const char* name, bool value);
53 extern template XBT_PUBLIC void set_default<std::string>(const char* name, std::string value);
55 XBT_PUBLIC bool is_default(const char* name);
59 template <class T> XBT_PUBLIC void set_value(const char* name, T value);
61 extern template XBT_PUBLIC void set_value<int>(const char* name, int value);
62 extern template XBT_PUBLIC void set_value<double>(const char* name, double value);
63 extern template XBT_PUBLIC void set_value<bool>(const char* name, bool value);
64 extern template XBT_PUBLIC void set_value<std::string>(const char* name, std::string value);
66 XBT_PUBLIC void set_as_string(const char* name, const std::string& value);
67 XBT_PUBLIC void set_parse(std::string options);
71 template <class T> XBT_PUBLIC T const& get_value(const char* name);
73 extern template XBT_PUBLIC int const& get_value<int>(const char* name);
74 extern template XBT_PUBLIC double const& get_value<double>(const char* name);
75 extern template XBT_PUBLIC bool const& get_value<bool>(const char* name);
76 extern template XBT_PUBLIC std::string const& get_value<std::string>(const char* name);
80 /** Register a configuration flag
82 * @param name name of the option
83 * @param description Description of the option
84 * @param value Initial/default value
85 * @param callback called with the option value
88 XBT_PUBLIC void declare_flag(const char* name, const char* description, T value,
89 std::function<void(const T&)> callback = std::function<void(const T&)>());
91 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, int value,
92 std::function<void(int const&)> callback);
93 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, double value,
94 std::function<void(double const&)> callback);
95 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, bool value,
96 std::function<void(bool const&)> callback);
97 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, std::string value,
98 std::function<void(std::string const&)> callback);
102 XBT_PUBLIC void alias(const char* realname, std::initializer_list<const char*> aliases);
104 /** Bind a variable to configuration flag
106 * @param value Bound variable
107 * @param name Flag name
108 * @param description Option description
110 template <class T> void bind_flag(T& value, const char* name, const char* description)
112 declare_flag<T>(name, description, value, [&value](T const& val) { value = val; });
116 void bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description)
118 bind_flag(value, name, description);
119 alias(name, std::move(aliases));
122 /** Bind a variable to configuration flag
126 * simgrid::config::bind_flag(a, "x", [](int x) {
127 * if (x < x_min || x => x_max)
128 * throw std::range_error("must be in [x_min, x_max)")
132 // F is a checker, F : T& -> ()
133 template <class T, class F>
134 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
135 bind_flag(T& value, const char* name, const char* description, F callback)
137 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
139 value = std::move(val);
143 template <class T, class F>
144 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
145 bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description, F callback)
147 bind_flag(value, name, description, std::move(callback));
148 alias(name, std::move(aliases));
151 template <class T, class F>
152 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
153 bind_flag(T& value, const char* name, const char* description, std::map<T, std::string> valid_values, F callback)
155 declare_flag(name, description, value,
156 std::function<void(const T&)>([&value, name, valid_values, callback](const T& val) {
159 for (auto kv : valid_values) {
163 if (not found || std::string(val) == "help") {
165 if (std::string(val) == "help")
166 mesg = std::string("\nPossible values for option ") + name + ":\n";
168 mesg = std::string("\nInvalid value '") + val + "' for option " + name + ". Possible values:\n";
169 for (auto kv : valid_values)
170 mesg += " - '" + std::string(kv.first) + "': " + kv.second +
171 (kv.first == value ? " <=== DEFAULT" : "") + "\n";
172 xbt_die("%s", mesg.c_str());
174 value = std::move(val);
177 /** Bind a variable to configuration flag
181 * simgrid::config::bind_flag(a, "x", [](int x) { return x > 0; });
184 // F is a predicate, F : T const& -> bool
185 template <class T, class F>
186 typename std::enable_if<std::is_same<bool, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
187 bind_flag(T& value, const char* name, const char* description, F callback)
189 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
190 if (not callback(val))
191 throw std::range_error("invalid value.");
192 value = std::move(val);
196 /** A variable bound to a CLI option
199 * static simgrid::config::flag<int> answer("answer", "Expected answer", 42);
200 * static simgrid::config::flag<std::string> name("name", "Ford Perfect", "John Doe");
201 * static simgrid::config::flag<double> gamma("gamma", "Gamma factor", 1.987);
211 * @param name Flag name
212 * @param desc Flag description
213 * @param value Flag initial/default value
215 Flag(const char* name, const char* desc, T value) : value_(value)
217 simgrid::config::bind_flag(value_, name, desc);
220 /** Constructor taking also an array of aliases for name */
221 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, T value) : value_(value)
223 simgrid::config::bind_flag(value_, name, std::move(aliases), desc);
226 /* A constructor accepting a callback that will be passed the parameter.
227 * It can either return a boolean (informing whether the parameter is valid), or returning void.
230 Flag(const char* name, const char* desc, T value, F callback) : value_(value)
232 simgrid::config::bind_flag(value_, name, desc, std::move(callback));
236 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, T value, F callback)
239 simgrid::config::bind_flag(value_, name, std::move(aliases), desc, std::move(callback));
242 /* A constructor accepting a map of valid values -> their description,
243 * and producing an informative error message when an invalid value is passed, or when help is passed as a value.
246 Flag(const char* name, const char* desc, T value, std::map<T, std::string> valid_values, F callback) : value_(value)
248 simgrid::config::bind_flag(value_, name, desc, std::move(valid_values), std::move(callback));
252 Flag(Flag const&) = delete;
253 Flag& operator=(Flag const&) = delete;
255 // Get the underlying value:
256 T& get() { return value_; }
257 T const& get() const { return value_; }
259 // Implicit conversion to the underlying type:
260 operator T&() { return value_; }
261 operator T const&() const{ return value_; }
263 // Basic interop with T:
265 Flag& operator=(U const& that) { value_ = that; return *this; }
267 Flag& operator=(U && that) { value_ = that; return *this; }
269 bool operator==(U const& that) const { return value_ == that; }
271 bool operator!=(U const& that) const { return value_ != that; }
273 bool operator<(U const& that) const { return value_ < that; }
275 bool operator>(U const& that) const { return value_ > that; }
277 bool operator<=(U const& that) const { return value_ <= that; }
279 bool operator>=(U const& that) const { return value_ >= that; }
284 XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::get_value<std::string>") XBT_PUBLIC std::string
285 xbt_cfg_get_string(const char* name);